如何获取加了SSL的web应用路径

这个是现在正在处理的代码：
public String downLoadFileMethod(){
String realPath = request.getSession().getServletContext().getRealPath("/");
try {
fUrl = realPath + request.getParameter("fUrl");
System.out.println("fUrl:"+fUrl);
if(fUrl != null && !"".equals(fUrl)){
String[] urlname = fUrl.split("/");
int len = urlname.length - 1;
String fielName = urlname[len];
URL url = new URL(fUrl);
HttpsURLConnection uc = (HttpsURLConnection) url.openConnection();
uc.setDoInput(true); //设置是否要从 URL 连接读取数据,默认为true
uc.connect();
InputStream iputstream = null;
//判断地址是否连接成功
if(HttpURLConnection.HTTP_OK==uc.getResponseCode()){
iputstream = uc.getInputStream();
}
request.setAttribute("filename", new String(fielName.getBytes(), "ISO8859_1"));
request.setAttribute("iputstream", iputstream);
}
} catch (Exception e) {
e.printStackTrace();
}

return "file";
}

跟没加SSL的获取方式是一样的。
在servlet中：getServletContext().getRealPath("/")